Piston-valve and packing for the same.



J. T. WILSUN. PISTON VALVE AND PACKING FOR THE SAME. APPLICATION FILED MAR- 2.19M;

1,143,009. Patented June 15, 1915.

a g 2/ 011 tlum UNITED STATES PATENT OFFICE.

Yatented J1me l5, 19-15.

Application flied xmn z, 1914. sum in; 522,910.

' I To all whom it may eon/cam Be it known that I, JOHN T. Woman, a. citizen of the l mited States, residing at Jersey Show. in the county of Lyoomin and State of Pennsylvania, have invents oentlain new and useful Improvements in Pismnvalvos and Poo-kings for the Some. of which the following is a specification My invention relates to iston valvos and in particular to lho pao 'ngs which am located at the ends of the valve and oont'rol the admission of steam and the dischorgo of steam from tho cylinder at opposlho sides of the engine piston; also to controlling the dogree of pressure of a packing of a piston valve against tl'loonrfaoe of the valve chombar.

The main object of tho invomion the provioion of a, relativoly wide ooking haw ing a i'olotivoly largo hearing oven in slight frictional contact with tho cage, and tho degreo of PIESSUYB of the packing agoinsl: tho cage automatically oontrollod by the fluid pressure which operales'tho engine: said packing comprising as a pant thereof a wide resilient oxpansiolo ring, preferably wider than the width of a port so it will he impossible for a ring to oateh m the porlix.

Horetofore thev practiml use of relatively wide packings or packing rings has been attended with wrv friotion z'oason of the oxco uro beneath the washings or rings. esiiltinz? n lhe wearing away of the cage or tho "kings, or both, in a very short 1 iiooi oi" canv I and in ax pondilzui-o of energy to op zmco l valve; con$equenllv wide pmzliiugs or packing: rings have boon dismrded and two separate relatively narrow rings substituted at each and of the pis fion valve which na i'ow rings in quently catch in the penis and cause great damage. k

My impim'omont permits the. use of realm tively wide, paokings or rings Without excessivo 'iclion and WQQI' of the makings or cages. and which cannot wish in a, poll.

A. Eurihov objool, the provision of a {Vflikllif having an oxmnsihle Wide ring with on li wzz wily extended flange which finngo in Jon with oil-Pr pow-I is used to look te'z'ior .n vnll not. 11g ll'l usv, oxcossivoly press ugril- A leather object tho provision of a puvkingz. 'Jfiiflill'l a relatively wide ex pansiblo ring. \i' hioll not only shall have a limited dogiroo of promote against the cage when in use, but which also provides for tho roliofi oi exoossivo pressure due to the prosence of, water of aondensation, or compressed ainwhentlw ongino isdx'ifting, and without inju. 1v of the packing.

A final obieot is the provision of a wido ring paokin. which can be loeked'against the cage wit a limited measure and which provides for the relief 0 excessive. pressures upon the outside of the packing, as previously specified, and While possessi these 'ohnz'aycleristics shall be comprised o relotivoly few" parts.

With the above main ends in View, the invention consists in oertain novelties of consti-uction and combination of parts are herein sea forih and claimed: also in the method of controlling the degree of pressure of a pnolain against the surface of a valve chambln" voroin sot forth. I

The accompanying drawin illustrates an examplo of tho ombodiment o the invention, the parts being oonstruotod and combined :Lutzoording to the best so for tested and demonsti-niod mode of procedure I have devised for the purpose.

Figure 1 is a section in elevation of an engine oylinder and valve chamber showingthe parts, including a piston and piston' valve, in theii' relative locations, the paolo inns of the piston valve being shown each wider than the-Width of a port. Fig. 2 is a broken section though the right and of the piston valve; the soot/ion at the top being through tho lap joint of the oxpansibile wide. swing or rosili nl ring, oxpansiblo narvow spring or re. .iont ring, oxpansihle Wedge ring. and twointogral Wall rings; and that al; the hoti om being through all the rings. Fig. 3 shows in elevation a Side View of part of the wide ring and the lap joint for the adjacent loose ends of the ring. Fig. 4 is a View in elevation of one end ofn Wide ring. Fig. 5 shows the adjacent ends of the wodge ring and lap ioinl. Fig. 6 is a section of Fig. 5 on line a r-12.

The packings. one at each end of the pis ton *mlvo. are identical and one only will be specifically described. Each packing comprises. in this example shown, five rings, though in some embodiments two of the rings may be omitted and the yvide ring, wedge Ping and one Wall ring porfo'mn the requisite functions: First, a relatively Wide out resilient expansihlo packing ring A. llZlTV- ing a. flange at one ,dge with an. inwardly extended beveled surlace 3, the free ends 4 y a suitable lap joint plate :r .own, to prewnt the passage of ,zllll our th top of the ring at the edge. The ends l united i and 5 bell slot 1" rnthin wh h lo ated a stud ll fixed to the end i ilni h Siaitl llfltilirl do all i t(l'lillil the lic' wide ton pan-ZZZ narrow pa 1 gnai e 1:3 extending enti ely around the ain; within whicn is looaly s ated the cd c 9 enon 13 ot the wide g. The part1. ends of this ring are uni'ird by a joint plate identical with that shown by Fig. 3, and it. also has the like beveled surlacc 3. so it need not be further described. The third and fourth rings and D, called wall rings, are each integral so they cannot expand or corn tract, but more sidcfisc only, The wall ring, C has a wide flange ll. the edge of which loosely overlaps the ring I) and can boar against the flange 15 on fd ring to limit the movements of 1 id Yl! toward each other. Both rings have similar he? clad surfaces 16 and 1?, the surfaces lo, 1(3

cut ltlllcllli eX- engaging beveled surfaces 2.). LE on inc flange of the wide packing ring and the side of the narrow packing ring. The fifth ring R a resilient expansihle wedge ring having the beveled edges 18 which engage the beveled surfaces 17. 17 of the wall rings, and a lap joint plate l9 shown by Figs. 5 and 6.

The piston valve body and spools may be made of any desirable constru-g ion and be provided with a circular re ess at oppoite ends or have a plurality of such reces when more tllnll two pachings are used. There is hown in thi instance a desirable form of eonstruction--a valve. hotly having: at ea h end a projecting ciiir flange 20 with a Vertical bearing surlace '21 and a series of l'ioles :2 for the adinisv'Jn of live steam eneath the ring by way of the series of openings 22% and 24. The extreme outer ends of the ralve body are threaded at :2 to re eirc adjustable threaded rings each ha ring a vertical bearing; r ntt'acc 97 to engage the pucking in this yise the flange 2 of the wide ring.

Recesses .38, are formed in flange 20 and ring 26, as shown, to loosely receive the studs 30. 3 set in the narrow packing ring and flange of the wide ring to prevent the morement of said rin gnarelative to the longitudinal axis of the valve body.

The wide packing: ring is hhown with holes through the same. and "w ith its outer surface prorided with ribs 352. but: the outer surface mav he plain.

n practiee the wide flanged spring ring ring ll, liming .zi'

and the, narrow spring ring are turned larger than the diameter of the cage, and then put in the cage under compression so the tension of the rings will cause them to expand against the inner surface of the cage.

\Yhen -team admitted to the central chandler it passes through the series of holes :33 to tile under surhu'cv of hoth packing-' In order to ins'ue the expansion of the nar- NW. and idw p i pking rings of each packing l'ii ll' to and in advance of any (iOilSltltTtLblG eri uusiin oi the wxdge ring. the steam i deliwi d in jets through huh Bil and directl); nst the under surfaces of said tr'o rings ..h are thus expanded quickly again: cage while the wedge ring has lly expanded or partly expanded. ii'l' expansion oi the we'll; ring under in: tea ed pressure of the steam mores the wall rings apart and locks the narrow and wide packing rings so thcy cannot eX- pan-d further against the cage. In their locked position the said packing rings bear again t the (rage ..:a!1iriei'itly to prevent the. passage of steam oier them. but with very little iessure. consequently in II'IUYlII "elm ional resistance between the pair. ,9; ring and cage and very little wear of the surfaces in the re iprocating: nioyenicnts of the packing whcn the alre is in action Ah the packing is locked in a sul'a tantially fixed p 'tion and the wide ring is a ider than a po the edge thereof cannot catch in a port. Furthernun-e. it is obvious that lifll'liil. ordinary conditions when the pa king is oier a port containing steam under pressure acting upon the exterior surface of the packing said pressure will not be suflicient to overcome the pressure beneath the packing and unlock the said packing. That is, the exterior pres sure will not be sufiicint to contract the packing rings under ordinary conditions. However. should the outer pressure upon the outer surfaces of a packing ovrrbalance the pr seine beneath the same and the frictional res stance of the beveled surfaces of the rings. due to the presence of water of con-- deusation in the cylinder, or other causes. the packing or part thereof may contract and the. vX(J('SSl\0 pressure thus he relieved, whereupon the packing is again locked in its proper position by the ex transion of the wedge ring. \Vhen the engine is drifting and air in the cylinder is compress 11 the pressure is relieved in a similar manner and without injuring the packing.

As shown by the drawing. the two Wall rings, inasmuch as the edge of flange 14 hears against flange 15 and limits the m0vement of said wall rings toward each other. lock the narrow and wide rings Within the recess in the spool through the enga ing beveled surfaces of the rings so the pac ing cannot become displaced.

tire to th cage there is but sl' htfrii.

From the description taken in connection with the drawing it is clear that I have produced an improved piston valve and a packing comprising a relatively Wide flanged expansible ringwhich will have its frictional contact with-a cage when in use automatically regulated, which provides for the relief of excessive pressure upon its exterior surface or excessive port pressure, which cannot catch in a port, which will not excessively wear the cage or itself be excessively worn away, due to the slight frictional contact with the cage, which can easily be operated, and whichpossesses other important characteristics of construction and combination and mode of operation as well as advantages in use which will be recognized by those skilled in the art.

What I claim is:

l. The combination with a valve body having a groove, of --a packing comprising a wide expansible packing ring with a flange, and a plurality of circular wedge rings one of which is expansible, an opening being provided for admitting motive fluid beneath thepacking to expand the ring with a flange against the valve chamber surface and then operating the wedges to lock said ring in its expanded position.

2. The combination with a. piston valve having l packing ring which is wider than the chamber port to the cylinder and provided with an inwardly extending. flange, of a system of circular wedges and means to admit motive fluid beneath said ring and wedges, whereby the degree of frictional contact of the packing ring 'against the chamber is automatically controlled by the pressure of the motive fluid 3. The combination with a valve chamber having a port opening to a cylinder, of a piston valve provided with a packing, said packing having a ring wider than the port and said ring also being prow'ded with a rigid flange, and circular wedges combined with said ring; means being provided for admitting operating fluid under pressure beneath said packing whereby the frictional contact of the packing with the surface of the valve chamber is automatically controlled.

4. A piston valve having a packing provided with a wide packing ring with a flange, and means for automatically controlling the frictional contact of the packing with the valve chamber surface.

5. The combination of an expansible wide packing ring with a'flange, a non-expansiblc wall ring. and an expansible wedge ring.

6. The combination of an expansible wide packing ring with, a flange, an expansible packing ring interlocking with the said wide ring, and means engaging the said two rings to lock said rings when expanded.

7. A separated resilient expansible wide packing ring having an inwardly projecting flange with a beveled surface.

8. The combination of a. separated expansible wide packing ring having a flange, and a plurality of rings with beveled surfaces for locking the packing ring in an expended position.

9. A separated expansible wide ring for a valve packing, said ring having an inwardly extended flange at the edge. with a beveled surface, and a joint plate in connection with the flange, said plate being rigidly secured to one end of the said ring and loosely overlapping the other end of the ring.

10. A separated expansible wide ring for a valve packing, said ring having an inwardly extended-flange with a beveled sur- I face, and a joint plate in connection with the flange.

11. A separated expansible wide packing ring for a valve packing, said ring having an inwardly extending flange at one edge, and a joint plate in connection with the flange, said plate being rigidly secured to one end of the said ring and loosely overlapping the other end of the ring,-'the plate interlocking with said wide ring, and .meaps for expanding and locking said rings against the cage. i

14. The combination in a valve packing,

of an expansible wide packing ring having an inwardly extended flange at one edge, an expansible packing ring at the other edge, an integral wall ring, and a wedge ring.

15. The combination in a valve having a recess for a packing and holes for the psssage of steam to said recess. of a packing comprising an cxpansible wide ring with a flange, an cxpansible narrow ring interlock ing with said wide ring, and means for locking the said rings when said rings have been expanded against the cage by steam pressure admitted beneath the rings.

In testimonv whereof I aflix my signature in presence of two witnesses.

JOHN '1. WILSON. Witnesses:

MILDRED B. Wmson, Tnorue Trrrm'r. 

